Clock keeps gaining time adjusted pendlum makes no differance

Question edited for clarity. Category moved to Clocks - Home.

Quartz digital clocks normally have no method of adjustment. The most likely reason it is gaining now is a failing capacitor or resistor. A voltage is applied to a quartz crystal and the electrical vibrations from it are translated into time. This article suggests there may be a 'trimmer pot' inside. They look like a short 1/4" block, or a circular device with a Bakelite screw slot in the middle. The need VERY small changes.

https://pressf1.pcworld.co.nz/showthread.php?139381-My-Digital-Clock-Gains-Time

It you really want accuracy, buy a new Atomic Clock that is set automatically via a Time Server.

https://www.google.com/search?q=spartus+1183-61&rlz=1C1QJDB_enCA643CA644&oq=spartus+1183-61

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American mantel clocks will gain or loose 5 minutes in a week, that is considered normal. This article will help you to adjust your time using the pendulum.

http://usedclockparts.com/9-clock-case-repairs/31-how-to-speed-up-or-slow-down-your-clock-using-it-s-pendulum

Normally there is an adjustment available. /contact the manufacturer.

Watch this interesting video about
Dunhaven Mantelclock www.youtube.com/watch?v=jFcUXJ8iv8g

I have to ask where you bought the unit? Did it just start doing this or has it done this since new? The reason I ask is if you have a 50 Hz unit and it is operating on 60 Hz it will gain time and there is no adjustment.

If the timer goes too fast you have to replace it.

Select model here to get part and diagram.

digital clocks work of the frequency input of the power source so it is possible to have it adjusted by a technician
like fine tuning a radio frequency there may be a pot that can be tuned to mains frequency exactly
talk with technicians in radio or tv shops or possible some jewellers who work on electric clocks may help

They used to use crystals to help the timer ics to keep time but since the development of Micropros. all this is built in to one chip. Now they will use a resonator or a small crystal for the timing clock of the micro but nowdays the manufacture uses that clock to keep all in check. If your gaining time you probably are having problems with your ac duty cycle as this also keeps clocks in check.. This would not affect most devices but could be a problem. But of course a defective Micro could also cause this gain in time And probably is?? Now a battery backup is nothing more then a battery in line with the Microproccesors B+ terminal through of course a diode as well as a voltage limiter resistor to take over the B+ when the units ac supply is absent..

Did you use the same batteries? try to use new ones... sorry i can't help you more